diff --git a/config/app.php b/config/app.php
index 5757ea7e..8409e00e 100644
--- a/config/app.php
+++ b/config/app.php
@@ -39,7 +39,7 @@
     |
     */
 
-    'debug' => env('APP_DEBUG', false),
+    'debug' => (bool) env('APP_DEBUG', false),
 
     /*
     |--------------------------------------------------------------------------
diff --git a/config/cache.php b/config/cache.php
index 46751e62..4f41fdf9 100644
--- a/config/cache.php
+++ b/config/cache.php
@@ -39,6 +39,7 @@
 
         'array' => [
             'driver' => 'array',
+            'serialize' => false,
         ],
 
         'database' => [
diff --git a/config/mail.php b/config/mail.php
index 67fb3409..cfef410f 100644
--- a/config/mail.php
+++ b/config/mail.php
@@ -47,6 +47,14 @@
             'transport' => 'ses',
         ],
 
+        'mailgun' => [
+            'transport' => 'mailgun',
+        ],
+
+        'postmark' => [
+            'transport' => 'postmark',
+        ],
+
         'sendmail' => [
             'transport' => 'sendmail',
             'path' => '/usr/sbin/sendmail -bs',
diff --git a/phpunit.xml b/phpunit.xml
index 383f71ef..5cf0875e 100644
--- a/phpunit.xml
+++ b/phpunit.xml
@@ -7,7 +7,6 @@
         <testsuite name="Unit">
             <directory suffix="Test.php">./tests/Unit</directory>
         </testsuite>
-
         <testsuite name="Feature">
             <directory suffix="Test.php">./tests/Feature</directory>
         </testsuite>